Businesses can apply for EINs directly through the IRS, which usually issues them immediately. An employer identification number is a unique nine-digit number that is assigned to a business entity.

This article was expert reviewed by Lisa Niser, EA, an enrolled agent and tax advisor. An employer identification number (EIN) is assigned to a business by the IRS. EINs serve a similar purpose as ...

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Employer Identification Number (EIN) Definition: A 9-digit number obtained by a business with paid employees from the IRS. If you're a sole proprietorship, your EIN is your social security number.